Georges B. Tatum, Philadelphia Georgian: The City House of Samuel Powel and Some of its Eighteenth-Century Neighbors, Photographs by Cortland and Van Dyke Hubbard, Middletown, Conn., Wesleyan University Press, 1976. 187 + xvii pp., 65 illus., $17.50 - DiStefano, Lynne (RACAR : Revue d'art canadienne / Canadian Art Review)